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appprovider.go
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appprovider.go
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// Copyright 2018-2021 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package gateway
import (
"context"
"crypto/tls"
"fmt"
"net/url"
"strings"
providerpb "github.com/cs3org/go-cs3apis/cs3/app/provider/v1beta1"
registry "github.com/cs3org/go-cs3apis/cs3/app/registry/v1beta1"
gateway "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
ocmprovider "github.com/cs3org/go-cs3apis/cs3/ocm/provider/v1beta1"
rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
storageprovider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
typespb "github.com/cs3org/go-cs3apis/cs3/types/v1beta1"
"github.com/cs3org/reva/pkg/appctx"
ctxpkg "github.com/cs3org/reva/pkg/ctx"
"github.com/cs3org/reva/pkg/errtypes"
"github.com/cs3org/reva/pkg/rgrpc/status"
"github.com/cs3org/reva/pkg/rgrpc/todo/pool"
"github.com/pkg/errors"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
)
func (s *svc) OpenInApp(ctx context.Context, req *gateway.OpenInAppRequest) (*providerpb.OpenInAppResponse, error) {
resChild := ""
statRes, err := s.Stat(ctx, &storageprovider.StatRequest{
Ref: req.Ref,
})
if err != nil {
return &providerpb.OpenInAppResponse{
Status: status.NewInternal(ctx, err, "gateway: error calling Stat on the resource path for the app provider: "+req.Ref.GetPath()),
}, nil
}
if statRes.Status.Code != rpc.Code_CODE_OK {
return &providerpb.OpenInAppResponse{
Status: statRes.Status,
}, nil
}
fileInfo := statRes.Info
// The file is a share
if fileInfo.Type == storageprovider.ResourceType_RESOURCE_TYPE_REFERENCE {
uri, err := url.Parse(fileInfo.Target)
if err != nil {
return &providerpb.OpenInAppResponse{
Status: status.NewInternal(ctx, err, "gateway: error parsing target uri: "+fileInfo.Target),
}, nil
}
if uri.Scheme == "webdav" {
insecure, skipVerify := getGRPCConfig(req.Opaque)
return s.openFederatedShares(ctx, fileInfo.Target, req.ViewMode, req.App, insecure, skipVerify, resChild)
}
res, err := s.Stat(ctx, &storageprovider.StatRequest{
Ref: req.Ref,
})
if err != nil {
return &providerpb.OpenInAppResponse{
Status: status.NewInternal(ctx, err, "gateway: error calling Stat on the resource path for the app provider: "+req.Ref.GetPath()),
}, nil
}
if res.Status.Code != rpc.Code_CODE_OK {
err := status.NewErrorFromCode(res.Status.GetCode(), "gateway")
return &providerpb.OpenInAppResponse{
Status: status.NewInternal(ctx, err, "Stat failed on the resource path for the app provider: "+req.Ref.GetPath()),
}, nil
}
fileInfo = res.Info
}
return s.openLocalResources(ctx, fileInfo, req.ViewMode, req.App)
}
func (s *svc) openFederatedShares(ctx context.Context, targetURL string, vm gateway.OpenInAppRequest_ViewMode, app string,
insecure, skipVerify bool, nameQueries ...string) (*providerpb.OpenInAppResponse, error) {
log := appctx.GetLogger(ctx)
targetURL, err := appendNameQuery(targetURL, nameQueries...)
if err != nil {
return nil, err
}
ep, err := s.extractEndpointInfo(ctx, targetURL)
if err != nil {
return nil, err
}
ref := &storageprovider.Reference{Path: ep.filePath}
appProviderReq := &gateway.OpenInAppRequest{
Ref: ref,
ViewMode: vm,
App: app,
}
meshProvider, err := s.GetInfoByDomain(ctx, &ocmprovider.GetInfoByDomainRequest{
Domain: ep.endpoint,
})
if err != nil {
return nil, errors.Wrap(err, "gateway: error calling GetInfoByDomain")
}
var gatewayEP string
for _, s := range meshProvider.ProviderInfo.Services {
if strings.ToLower(s.Endpoint.Type.Name) == "gateway" {
gatewayEP = s.Endpoint.Path
}
}
log.Debug().Msgf("Forwarding OpenInApp request to: %s", gatewayEP)
conn, err := getConn(gatewayEP, insecure, skipVerify)
if err != nil {
log.Err(err).Msg("error connecting to remote reva")
return nil, errors.Wrap(err, "gateway: error connecting to remote reva")
}
gatewayClient := gateway.NewGatewayAPIClient(conn)
remoteCtx := ctxpkg.ContextSetToken(context.Background(), ep.token)
remoteCtx = metadata.AppendToOutgoingContext(remoteCtx, ctxpkg.TokenHeader, ep.token)
res, err := gatewayClient.OpenInApp(remoteCtx, appProviderReq)
if err != nil {
log.Err(err).Msg("error returned by remote OpenInApp call")
return nil, errors.Wrap(err, "gateway: error calling OpenInApp")
}
return res, nil
}
func (s *svc) openLocalResources(ctx context.Context, ri *storageprovider.ResourceInfo,
vm gateway.OpenInAppRequest_ViewMode, app string) (*providerpb.OpenInAppResponse, error) {
accessToken, ok := ctxpkg.ContextGetToken(ctx)
if !ok || accessToken == "" {
return &providerpb.OpenInAppResponse{
Status: status.NewUnauthenticated(ctx, errtypes.InvalidCredentials("Access token is invalid or empty"), ""),
}, nil
}
provider, err := s.findAppProvider(ctx, ri, app)
if err != nil {
err = errors.Wrap(err, "gateway: error calling findAppProvider")
if _, ok := err.(errtypes.IsNotFound); ok {
return &providerpb.OpenInAppResponse{
Status: status.NewNotFound(ctx, "Could not find the requested app provider"),
}, nil
}
return nil, err
}
appProviderClient, err := pool.GetAppProviderClient(provider.Address)
if err != nil {
return nil, errors.Wrap(err, "gateway: error calling GetAppProviderClient")
}
appProviderReq := &providerpb.OpenInAppRequest{
ResourceInfo: ri,
ViewMode: providerpb.OpenInAppRequest_ViewMode(vm),
AccessToken: accessToken,
}
res, err := appProviderClient.OpenInApp(ctx, appProviderReq)
if err != nil {
return nil, errors.Wrap(err, "gateway: error calling OpenInApp")
}
return res, nil
}
func (s *svc) findAppProvider(ctx context.Context, ri *storageprovider.ResourceInfo, app string) (*registry.ProviderInfo, error) {
c, err := pool.GetAppRegistryClient(s.c.AppRegistryEndpoint)
if err != nil {
err = errors.Wrap(err, "gateway: error getting appregistry client")
return nil, err
}
// when app is empty it means the user assumes a default behaviour.
// From a web perspective, means the user click on the file itself.
// Normally the file will get downloaded but if a suitable application exists
// the behaviour will change from download to open the file with the app.
if app == "" {
// If app is empty means that we need to rely on "default" behaviour.
// We currently do not have user preferences implemented so the only default
// we can currently enforce is one configured by the system admins, the
// "system default".
// If a default is not set we raise an error rather that giving the user the first provider in the list
// as the list is built on init time and is not deterministic, giving the user different results on service
// reload.
res, err := c.GetDefaultAppProviderForMimeType(ctx, ®istry.GetDefaultAppProviderForMimeTypeRequest{
MimeType: ri.MimeType,
})
if err != nil {
err = errors.Wrap(err, "gateway: error calling GetDefaultAppProviderForMimeType")
return nil, err
}
// we've found a provider
if res.Status.Code == rpc.Code_CODE_OK && res.Provider != nil {
return res.Provider, nil
}
// we did not find a default provider
if res.Status.Code == rpc.Code_CODE_NOT_FOUND {
err := errtypes.NotFound(fmt.Sprintf("gateway: default app rovider for mime type:%s not found", ri.MimeType))
return nil, err
}
// response code is something else, bubble up error
// if a default is not set we abort as returning the first application available is not
// deterministic for the end-user as it depends on initialization order of the app approviders with the registry.
// It also provides a good hint to the system admin to configure the defaults accordingly.
err = errtypes.InternalError(fmt.Sprintf("gateway: unexpected grpc response status:%s when calling GetDefaultAppProviderForMimeType", res.Status))
return nil, err
}
// app has been forced and is set, we try to get an app provider that can satisfy it
// Note that we ask for the list of all available providers for a given resource
// even though we're only interested into the one set by the "app" parameter.
// A better call will be to issue a (to be added) GetAppProviderByName(app) method
// to just get what we ask for.
res, err := c.GetAppProviders(ctx, ®istry.GetAppProvidersRequest{
ResourceInfo: ri,
})
if err != nil {
err = errors.Wrap(err, "gateway: error calling GetAppProviders")
return nil, err
}
// if the list of app providers is empty means we expect a CODE_NOT_FOUND in the response
if res.Status.Code != rpc.Code_CODE_OK {
if res.Status.Code == rpc.Code_CODE_NOT_FOUND {
return nil, errtypes.NotFound("gateway: app provider not found for resource: " + ri.String())
}
return nil, errtypes.InternalError("gateway: error finding app providers")
}
// as long as the above mentioned GetAppProviderByName(app) method is not available
// we need to apply a manual filter
filteredProviders := []*registry.ProviderInfo{}
for _, p := range res.Providers {
if p.Name == app {
filteredProviders = append(filteredProviders, p)
}
}
res.Providers = filteredProviders
// if we only have one app provider we verify that it matches the requested app name
if len(res.Providers) == 1 {
return res.Providers[0], nil
}
// we should never arrive to the point of having more than one
// provider for the given "app" parameters sent by the user
return nil, errtypes.InternalError(fmt.Sprintf("gateway: user requested app %q and we provided %d applications", app, len(res.Providers)))
}
func getGRPCConfig(opaque *typespb.Opaque) (bool, bool) {
if opaque == nil {
return false, false
}
_, insecure := opaque.Map["insecure"]
_, skipVerify := opaque.Map["skip-verify"]
return insecure, skipVerify
}
func getConn(host string, insecure, skipverify bool) (*grpc.ClientConn, error) {
if insecure {
return grpc.Dial(host, grpc.WithInsecure())
}
// TODO(labkode): if in the future we want client-side certificate validation,
// we need to load the client cert here
tlsconf := &tls.Config{InsecureSkipVerify: skipverify}
creds := credentials.NewTLS(tlsconf)
return grpc.Dial(host, grpc.WithTransportCredentials(creds))
}